@article{Lockwood2000,
	title = {Specific and ad valorem tariffs are not equivalent in trade wars},
	author = {Ben Lockwood and Kar-yiu Wong},
	journal = {Journal of International Economics},
	month = {Oct},
	number = {1},
	pages = {183--195},
	url = {http://www.sciencedirect.com/science/article/B6V6D-4105CKG-9/1/eaf5f3db159d4f982f85315c8d77fc71},
	volume = {52},
	year = {2000},
	biburl = {http://www.bibsonomy.org/bibtex/2f1a3b74c9e59a676fe930796e05e98a8/smicha},
	keywords = {Equivalence ad and between specific tariffs valorem }
}